i found this with interest -- its a device that goes in between your stock steering wheel (audio controls) and your new Pioneer head unit. you can then assign the wheel's buttons to the supported actions in the unit (volume up/down, track +/-, source, etc).
has anyone used one w/ the AVIC products? did it work well for you?
http://www.amazon.com/PAC-SWI-PS-Pionee ... y_e_text_c
...only 40 bucks.
thanks!
matt